My laptop is down.. It's a Compaq Presario C500 that I bought 3~4 years ago..

1. Recently when I shut it down, it will not shutdown and hence, restart..
2. And now when I boot it, it will show a booting style page and when I choose any single of them, it loads and BSOD, then restarted.
3. I tried to reformat.. The 1st case is that the setup cannot find any harddisk.. 2nd case now is that the space on the computer is not enough for the setup to install windows XP..

I really really need help.. Please help, thanks..